CENTOS 7 kernel upgrade

I have been using CENTOS 7 successfully for a while, but now I have a problem. Need to update the kernel to 4.14.87. Found a tar of that kernel release and tried to install, but just came up with problem after problem, because of the need to update other parts of the OS before I could move forward with the kernel update. Failed at this point, so searched for a later release of CENTOS 7. I believe CENTOS 7.7 is what I need. Found CentOS-7-x86_64-Everything-1908.ISO, which was 10GB file, so downloaded and burned to Blu Ray disc. Too big for DVD. This was successful, but when I tried to install to a new sata disk it went through all the usual processes, but just ended up with a prompt, showing a very old kernel version 3.10.

Anyone got any ideas of how to move forward on getting and installing CENTOS 7.7 with much more up-to-date compilers etc., so that I can install the required kernel release ?